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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f88ea1f0bf7d4a03c50e52e8ec7ccd757a8777444b9c7c800c0bfe9ca4358875' 
  AND token = '15FarYlNSsdR4TExD5DXMGaF2rNm4lgh2bAg1e3smmw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}